Cmos Definition and 76 Threads

I was thinking about how CCD's and CMOS's almost exclusively come in multiples. To be clear, what I am referring too is how each chip is fabricated to feature many pixels. Does the fundamental unit of a CCD/CMOS have a name "commercially"? Something like a "single pixel camera"? Looking at...

From page 4-9 of this lecture note https://pallen.ece.gatech.edu/Academic/ECE_6412/Spring_2004/L180-PSRR-2UP.pdf, it gives example on how to model a Two-Stage Op Amp to find the PSRR- when VBias is connecting to ground as oppose to when VBias is connecting to Vss. One thing I don't understand is...

Full problem: I don't normally think about circuits like these in terms of energy (Joules) so I was very much confused. What I did was find where the simplified expressions intercepts with each other to get the voltage. I scanned in my work although this text is a walk through of what I did...

Guys ! I need your help in choosing a better project for my last semester .Can anyone suggest me projects based on CMOS VLSI Technology.?

As attached below, I have drawn the step down and up diagram. However comparing to the answer, it seems to be way too off. Any idea why? Answer: Is there something wrong with my step down/step up circuit?

Hi all :) So I constructed this based on a video tutorial, p, and n MOS, and was wondering if it was correct before I combine them. Also, it looks very different from what the proposed answer is. Since the equation is z=ab, The pull-down diagram looks like this: and the pull-up is z= a'+b'...

Inside a CPU, when applying voltage to the gates of the CMOS transistor(high input), are the gate ore another components of a transistor will generate thermal radiation which will be absorbed by the neighboring transistor?

I made a table using excel as: D is output. Like this I get Output frequency is same as input frequency. But I'm not sure if this is correct. PS: I'm aware I'm posting many questions, but I got interview exams coming up in August. Companies are going to come to university for recruitment and...

I use the voltage divider rule as output voltage = Voltage across R1 = 5 * ( 0.5 / (0.5 + 20) ) This comes as 0.122 V I'm not sure why they've mentioned I leakage and does 0-state have any impact on answer.

Hi, I was reading about CMOS BIOS which was once used in computers to store BIOS settings is a CMOS RAM using a battery backup. This article, https://www.makeuseof.com/tag/why-does-my-motherboard-have-a-battery/, says, "If the battery fails on an older computer that stores its BIOS settings...

Homework Statement Calculate the ration of ##w_p/w_n## if n and p transistors in CMOS inverter necessary for the least delay time ##t_p## if the circuit is used in a chain of circuits. a) What is ##w_p## in that circuit if you're given : b) Calculate the maximum short circuit current if...

Hey :) I am currently doing a project on university in cooperation with CERN where I have to find new business fields for light sensitive sensors (CMOS) which every camera contains. The special feature is the radiation hardness. So you can use it for example for detecting x-rays or you can use...

Hello all, I want to know a suitable way to calculate VTL and VTH of a gate having the gate schematic and constituent transistors SPICE model (NMOS/PMOS models). Is there an easier than doing hand calculations ?

I am now trying to design a photonic integrated circuit which will be used to replace the global interconnect layer of a LSI. I need to somehow take the output of a photodiode w/o TIA (10G signal perhaps) and then transmit that signal to other layer of the LSI by TSV or something. Assume a...

Homework Statement This question has several parts, and I'm confused about some of them. Consider ##Z = \overline{(A + B \bar{C})D + E \bar{F}}##. Assume primary and inverted inputs are available. A) Implement the function in conventional CMOS logic style such that only 4 transistors are...

Hello engineers! :)I have a question bothering me i quite can't figure out. I have a Priority encoder: http://www.digikey.com/product-search/en?vendor=0&keywords=ls148d&stock=1 datasheet: http://www.ti.com/lit/ds/symlink/sn74ls148.pdfAnd this RF-Switch...

I need to somehow take the output of a CMOS IC and transmit that signal over a 50 Ohm Microstrip line. The output impedance of the CMOS IC is about 15 megaohms. I see a lot of examples for going from 75 ohms to 50 ohms or similar but nothing on something of this magnitude. Any ideas? CMOS...

Homework Statement 1)Determine the min acceptable values for VIH and VOH using VCC = 4.5 V and output current of 20 µA. 2)Determine the maximum acceptable values for VOL and VIL under the same test conditions. 3)Compute the noise margins. Homework Equations i=v/R The Attempt at a Solution...

Hi I've been searching for a CMOS or CCD sensor with raw analog output and external reset/transfer control but has not been able to find this. Doesn't have to be great resolution. Anyone knows if there is a sensor like this on the market today? Best Johan

Hi, I would like to understand the reason for the "Black sun" effect that occurs in CMOS cameras (very bright spots appear as dark). Thanks, ALex

Homework Statement Q. I was given a equation for PMOS and NMOS drain current in triode region but I am having some confusion regarding equation please do help. I think drain to source current in PMOS should be negative but in equation value will come out to be positive if I keep V(gs) ,V(ds)...

I am simulating cmos inverter in CADENCE I am getting a sharp spike when output is going from low to high and spike became more amplified like when i made rise time and fall time of input rectangular pulse signal very low . . .can somebody explain why this happening ?

Hello. Can someone explain to me what does $V_i=L$ and $V_i=H$ mean in CMOS inverters?

Hello. Can someone explain to me what does ##V_i=L## and ##V_i=H## mean in CMOS inverters?

when designer design new circuit, they think what's the requirement step I 1)power dissipation should be less 2)raise time and fall time should be less 3)propagation delay time should be less 4)size should be small as possible step II 1) how can we reduce power dissipation in cmos...

Please help me with the question in the picture about pull-up and pull-down networks.

Hi guys, Recently I had to design a SPDT switch for a project, which I was able to design using the trivial circuit with 2 transmission gates and 1 MOS inverter, like this: http://www.semicon.toshiba.co.jp/eng/product/new_products/logic/1326183_37648.html I think that this circuit is not...

I have been experimenting with PWM circuits and I came across this CMOS comparator that seems to work well with the sawtooth generator I am using. I feed a sawtooth wave to the gate of the PMOS M3 transistor and the reference voltage I am comparing to Vin the PMOS M4. I noticed that the...

Homework Statement uploaded Homework Equations uploaded The Attempt at a Solution I have Jsim installed and working and have the circuit correctly done. I however don't understand how the coding works in Jsim. I essentially need the equivalent circuit in Jsim code. I need help...

When calculating delay, like the fall time delay of the output, through an inverter with rc model of the transistors (assuming Cmos inverter) why do we neglect the short circuit current through the device and what are the assumptions. Can anyone explain this?

Homework Statement I'm trying to simulate the following circuit in OrCAD PSPICE. Homework Equations The Attempt at a Solution * 8.20 Vdd 1 0 5V MP1 3 2 1 1 PMOD MN1 3 2 0 0 NMOD MP2 4 3 1 1 PMOD MN2 4 3 0 0 NMOD R1 3 2 1000 C1 2 4 1uF .MODEL...

In the attached photo, I found M2 to be triode region b/c the drain and drain source voltage is 0 which will always be less than the output voltage. However, I am have troubles finding M1's region of operation, VDS >= VGS - VTH. Vout - Vbias >= Vdd - Vbias - VTH **Vbias = 0.8 V...

Hi all, I have gave this question a lot of thought but can't seem to get anywhere. Any help will be much appreciated. Homework Statement For a digital logic inverter for which k'n = 120 uA/V^2, k'p = 60 uA/V^2, Vtn = |Vtp| = .7V, VDD = 3V, Ln = Lp = .8 um, Wn = 1.2 um and Wp = 2.4 um...

Hi all. I don't know if I have given this enough thought but I will ask anyway. I know that a CMOS is an inverter, so for input High you will get output Low, and for input Low you will get output High. I am trying to find this out mathematically (or even just logically) but I can't seem to do...

I understand how to draw a CMOS circuit but I am not so confident if I do it right. I need someone to check if I draw them right. As for the second one which is a XOR gate, I am not sure at all on how to draw it since there are both the 0 and 1 inputs in the circuit.

Homework Statement We just did an experiment on the input and output characteristics of TTL and CMOS NAND gates. We recorded the following data for each of the two gates. 1) Input Threshold Voltage 2) Input Current(for input logic 1 and 0) 3) Output Voltage(for output logic 1 and 0) 4)...

I'm a bit of a noob on all of this, but can anyone help me (or point to a great reference resource) on pro's and con's of each in designing a power management circuit? Specifically, I'm looking for what kinds of voltage and frequency applications each manufacturing process is used nowadays...

Homework Statement I saw this image in the internet. I want to learn how to recognize the gate, source and drain for NMOS and PMOS. The Attempt at a Solution I don't know if I am correct or not. M8 ( with an arrow coming out ) is NMOS. M7B (with an arrow going in) is a PMOS...

Homework Statement I drew a NAND in the picture. The Attempt at a Solution I know when A and B are both high ( value 1), resistance will be Rn + Rn because those 2 NMOS will be turned on and resistance will added up since they are in series. Also when A and B are both...

Homework Statement It given the expression . how to construct the complex CMOS gate by looking at the expression. Homework Equations The Attempt at a Solution This solution is given as well. I don't understand how he construct it. I know NAND is fromed by two PMOS in...

Hello. One of my friends told me that the logic function for (A.or.B).and.(C.or.D) is From a book, I know the P1, P2 , N1, N2 form a NAND. The same for P3, P4, N3, N4. And P5, P6, N5, N6 form a NOR. My question is, is this circuit the same as (A.or.B).and.(C.or.D) ? Thank you

Hi. I receive an error message once simulating in PSPICE. I have attached a file that explains the problem in details. Will be glad to know the source of the problem. Thanks! :redface:

Hello, I have a question about how to analyze the CMOS inverter (this circuit: http://www.cs.umass.edu/~weems/CmpSci635A/Lecture2/image10.gif ). Just to clarify, the input voltage is connected to both gates, and the PMOS on top has its source connected to Vdd. The NMOS on the bottom has its...

Hello, I am hoping someone can give me a little bit of help. I have been simulating a CMOS inverter circuit. When I add in a pulse source at the input, and simulate it, I get an output which has a bit of a spikle on the transition. I am hoping someone can help my understand why this is...

Heres an interview question which I am having trouble with: Consider a CMOS inverter. Replace the NMOS in it with a PMOS. How would the VTC curve look like? I was told that one PMOS would always be in saturation. Since the source voltage of the lower PMOS is tied to Vout, how can we...

Can a CMOS sensor be used as a Geiger counter To help the folks in Japan protect themselves from contaminated food and to get some assurance of the safety of their homes, we are putting together a team to evaluate the feasibility of writing an iPhone/Android application that would use the CMOS...

Hi, new to these forums and glad I found them! I am working on a project that requires conversion of fairly hi-speed signals (10us pulses) from 5V to 12V. The usual open collector with a pull up is much too slow getting from 0 to 12V. I really need the ramp to happen between .05us to 1us...

Why is the CMOS logic voltage exactly 3.3V, why not 3V or 3.5V?

I'm looking for a small camera to use in my rocket. It's about a 7' rocket, 4" diameter and 3" long viewing window. I've heard that the choices are either cmos or ccd but I don't know the difference between the two. I'm only looking to spend up to $100 (really looking in the $50 range). Any...

Hi all, I have a question about the response of a cmos imaging sensor. The total exposure is defined as the irradiance * pixel area * exposure time and it can be varied by changing either the irradiance or the exposure time. Would the sensor response remain constant if measurements are taken...